Outpatient Control-to-Range: System and Monitoring Testing

University of Virginia

Status

Completed

Conditions

Type 1 Diabetes Mellitus

Treatments

Device: Outpatient Control-to-Range

Study type

Interventional

Funder types

Other

Identifiers

NCT01578980

16130

Details and patient eligibility

About

A single arm, single treatment study is proposed to assess the feasibility of the AP Platform (cell phone + Control to Range system) outside of a hospital based clinical research center.

Full description

Automated closed-loop control (CLC) of blood glucose, known as "artificial pancreas" (AP) can have tremendous impact on the health and lives of people with type 1 diabetes (T1DM). This inter-institutional and international research team has been on the forefront of CLC developments since the beginning of the Juvenile Diabetes Research Foundation (JDRF) Artificial Pancreas initiative in 2006. Thus far, the investigators have conducted three closed-loop control clinical trials (totaling 60 subjects with T1DM), which demonstrated significantly more time in an acceptable "target" blood glucose range during CLC, and significantly fewer hypoglycemic events during CLC compared to open loop. The overall objective is to sequentially test, validate, obtain regulatory approval for, and deploy at home, a closed-loop Control-to-Range (CTR) system comprised of two algorithmic components: a Safety Supervision Module (SSM) and a Hypoglycemia Mitigation Module (HMM). The SSM will monitor the safety of the subject's continuous subcutaneous insulin infusion pump (CSII) to prevent hypoglycemia and will also monitor the integrity of continuous glucose monitor (CGM) data for signal sensor deviations or loss of sensitivity. The HMM will be responsible for the optimal regulation of postprandial hyperglycemic excursions through correction boluses.

This study will test the ability of AP Platform to (1) run CTR in an outpatient setting, and (2) be remotely monitored. Specifically, this study involves studying adults with T1DM who are experienced insulin pump users. Subjects will spend two nights (~42 hours) in a local hotel, during which the AP Platform will be remotely monitored in an adjacent hotel room for validation that remote system monitoring can successfully occur. During the study, study subjects will be responsible for operating the CTR system with nursing and technicians available for additional support. A study physician and senior engineer will be on call.

Five subjects each will be enrolled at University of Virginia and the University of California, Santa Barbara.

Enrollment

20 patients

Sex

All

Ages

21 to 65 years old

Volunteers

No Healthy Volunteers

Inclusion and exclusion criteria

INCLUSION CRITERIA

≥21 and <65 years old
Clinical diagnosis of type 1 diabetes mellitus:
- Criteria for documented hyperglycemia (at least 1 criterion must be met):
  - Fasting glucose ≥126 mg/dL - confirmed
  - Two-hour Oral Glucose Tolerance Test (OGTT) glucose ≥200 mg/dL - confirmed
  - HbA1c ≥6.5% documented by history - confirmed
  - Random glucose ≥200 mg/dL with symptoms
  - No data at diagnosis is available but the participant has a convincing history of hyperglycemia consistent with diabetes
- Criteria for requiring insulin at diagnosis (at least 1 criterion must be met):
  - Participant required insulin at diagnosis and continually thereafter
  - Participant did not start insulin at diagnosis but upon investigator review likely needed insulin (significant hyperglycemia that did not respond to oral agents) and did require insulin eventually and used continually
  - Participant did not start insulin at diagnosis but continued to be hyperglycemic, had positive islet cell antibodies - consistent with latent autoimmune diabetes in adults (LADA) and did require insulin eventually and used continually
Use of an insulin pump to treat his/her diabetes for at least 1 year
Actively using an insulin pump with bolus calculator feature including predefined parameters for carbohydrate ratio, insulin sensitivity factor, target blood glucose (BG) and active insulin.
HbA1c between 6.0% - 9.0% as measured with DCA2000 or equivalent device
Not currently known to be pregnant, breast feeding, or intending to become pregnant (females)
Demonstration of proper mental status and cognition for the study
Willingness to avoid consumption of acetaminophen-containing products during the study interventions
If on antihypertensive, thyroid, anti-depressant or lipid lowering medication, have stability on the medication for at least 2 months prior to enrollment in the study

EXCLUSION CRITERIA

Diabetic ketoacidosis within the 6 months prior to enrollment
Severe hypoglycemia resulting in seizure, loss of consciousness, or 3rd party assistance in the 12 months prior to enrollment
Subject reports that he/she has hypoglycemia unawareness with severe low blood sugars (e.g. <50 mg/dL without symptoms)
Pregnancy; breast feeding, or intention of becoming pregnant
Uncontrolled arterial hypertension (diastolic blood pressure >90 mmHg and/or systolic blood pressure >160 mmHg)
Conditions which may increase the risk of hypoglycemia such as any cardiac disorder/arrhythmia, uncontrolled coronary artery disease during the previous year (e.g. history of myocardial infarction, acute coronary syndrome, therapeutic coronary intervention, coronary bypass or stenting procedure, stable or unstable angina, episode of chest pain of cardiac etiology with documented EKG changes, or positive stress test or catheterization with coronary blockages >50%), congestive heart failure, history of cerebrovascular event, seizure disorder, syncope, adrenal insufficiency, neurologic disease or atrial fibrillation
Hematocrit <40% (males) and <35% (females)
History of a systemic or deep tissue infection with methicillin-resistant staph aureus or Candida albicans
Use of a device that may pose electromagnetic compatibility issues and/or radiofrequency interference with the CGM (implantable cardioverter-defibrillator, electronic pacemaker, neurostimulator, intrathecal pump, and cochlear implants)
Anticoagulant therapy other than aspirin
Oral steroids
Medical condition requiring use of an acetaminophen-containing medication that cannot be withheld for the study admissions.
Psychiatric disorders that would interfere with study tasks (e.g. inpatient psychiatric treatment within 6 months prior to enrollment)
Mental incapacity, unwillingness or language barriers precluding adequate understanding or cooperation
Known current or recent alcohol or drug abuse
Medical conditions that would make operating a CGM, cell phone, or insulin pump difficult (e.g. blindness, severe arthritis, immobility)
Any skin condition that prevents sensor or pump placement on the abdomen or arm (e.g. bad sunburn, pre-existing dermatitis, intertrigo, psoriasis, extensive scarring, cellulitis)
Impaired hepatic function measured as alanine aminotransferase or aspartate aminotransferase ≥three times the upper reference limit
Impaired renal function measured as creatinine >1.2 times above the upper limit of normal
Uncontrolled microvascular (diabetic) complications (other than diabetic non-proliferative retinopathy), such as current proliferative diabetic retinopathy, known diabetic nephropathy (other than microalbuminuria with normal creatinine) or neuropathy requiring treatment
Active gastroparesis requiring current medical therapy
If taking antihypertensive, thyroid, anti-depressant or lipid lowering medication, lack of stability on the medication for the past 2 months prior to enrollment in the study
Uncontrolled thyroid disease
Known bleeding diathesis or dyscrasia
Known allergy to medical adhesives, components of the insulin pump insertion set or continuous glucose monitor sensor
Active enrollment in another clinical trial
Unwillingness to withhold dietary supplements two weeks prior to admission and for the duration of the study participation
Use of anti-diabetic agents other than CSII including long-acting insulin, intermediate-acting insulin, metformin, sulfonylureas, meglitinides, thiazolidinediones, DPP-IV inhibitors, glucagon-like peptide 1 agonists, and alpha-glucosidase inhibitors
Subjects with basal rates less than 0.05.

RESTRICTIONS ON USE OF OTHER DRUGS OR TREATMENTS.

Use of anti-diabetic agents other than CSII including long-acting insulin, intermediate-acting insulin, metformin, sulfonylureas, meglitinides, thiazolidinediones, DPP-IV inhibitors, glucagon-like peptide 1 agonists, and alpha-glucosidase inhibitors.
Oral steroids are excluded
Anticoagulant therapy other than aspirin is excluded
Acetaminophen will not be allowed while the continuous glucose monitor is in use
Dietary supplements will be withheld two weeks prior to admission and for the duration of study participation
Medications that block symptoms of hypoglycemia, including but not limited to beta blockers